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Chapter28-ImageProcessingFunctions
Remark
Table28.15:CIMG_merge_bitmap_alphaFunctionVariables
Variable
Description
src
Standardforsnowbndobject32-bitalphachannelimage
tomerge
dib_header
PointertoaCDIB_HEADERstructurecontainstheimage
header.Formoreinformation,seepublic
class
CDIB_
HEADER
.
xpos
Startingxcoordinateforwhichtomergeimage
ypos
Startingycoordinateforwhichtomergeimage
opaque
1=usetransparencychannelinformationtoblendimages
0=donotdrawanypixelswithtransparencychannel
informationpixelsset
Returns
Returnsthestatusofthemergebitmapalphachannelimageoperation.Anyvaluelessthan
zeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferror
codes.
CIMG_process_bitmap()
Thisfunctionisusedtoperformtheimageprocessingfunction.Asimple3x3matrixisapplied
totheimagefor8and24-bitimages.IfthevalueforthematrixpointerisnotNULL,itassumes
thatitcontainsvaluestobeappliedtotheimage.
ThisfunctionisaSobelimageprocessingfunction.Itcanbeusedasarelativelyinexpensive
edgedetectionfunctionortoenhancetheimage.Themethodparameterallowsyoutospecify
whichmethodtousetoenhancetheimage.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
ThisfunctionisusedintheImage
Processing
sample.
Syntax
int SNBDAPI CIMG_process_bitmap(int type, Array* matrix);
Remark
Table28.16:CIMG_process_bitmapFunctionVariables
Variable
Description
type
Specifythetypeoffiltertobeperformed
0=Userdefined3*3matrix
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Chapter28-ImageProcessingFunctions
Variable
Description
1=Isolatepoints
2=Edgedetection
3=Horizontaledgedetection
4=Verticaledgedetection
5=45degreeedgedetection
6=-45degreeedgedetection
7=Laplacian
8=Dialation
9=RobertsCross
matrix
Arraythatcontainstheoperatorvaluetoapplytothe
imageifitisnotNULL,otherwiseitreturnstheoperator
array.
Returns
Returnsthestatusoftheprocessbitmapoperation.AnyvaluelessthanzeroisaSnowbound
errorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_remove_red_eye()
Thisfunctiondetectsandconvertsveryredeyesinphotostomorenaturalcolors.
Notes:
Ifxpos,ypos,xsize,orysizeissetto-1,theentirephotoissearched.
Forbestresults,refinethesearcharea.
Worksonlywith24-bitcolorimages.
Syntax
int SNBDAPI CIMG_remove_red_eye(int x, int y, int width, int
height);
Remarks
Table28.17:CIMG_remove_red_eyeFunctionVariables
Variable
Description
x
Startingtopleftareaforxcoordinate
y
Startingtopleftareaforycoordinate
width
Widthofareatosearch
height
Heightofareatosearch
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Chapter28-ImageProcessingFunctions
Returns
Returnstheremoveredeyeoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_resize_bitmap()
Thisfunctionscalestheimageupordowntothenewheightandwidth.Thispermanently
changestheheightandwidthoftheimage.
Tozoomlarger,useCIMG_resize_bitmap().Tozoomtoasmallersize,useCIMG_
create_
thumbnail
()
.
Topreserveaspectratio:
hresisthedestinationwidth.
vresthedestinationheight.
Setthewidthandheighttotheoriginalwidthandheightoftheimageafterdecompressas
showninthefollowingexample:
Example28.2PreservingAspectRatio
vres = (int)((long)height * hres / width);
CIMG_resize_bitmap(hres,vres);
Note:
IBMAFPprintersrequirethewidthofanimagetobeanexactmultipleof8.Tobeonthe
safeside,setthewidthtoamultipleof8.
Syntax
int SNBDAPI CIMG_resize_bitmap(int width, int height);
Remark
Table28.18:CIMG_resize_bitmapFunctionVariables
Variable
Description
width
Newwidthofimage
height
Newheightofimage
Returns
Returnstheresizebitmapoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
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Chapter28-ImageProcessingFunctions
CIMG_resize_bitmap_bicubic()
Thisfunctionusesabicubicinterpolationalgorithmtoscaledownimages.Thisisgoodfor
creatinghigh-resolutionthumbnailsofcolorimages.
IfthisfunctionreturnsanerrorsuchasPIXEL_DEPTH_UNSUPPORTEDorPALETTE_
IMAGES_NOT_ALLOWED,thentryusingCIMG_
create_
thumbnail
()
functionbecausethat
willtakeawidervarietyofinputbit-depthsthanCIMG_resize_bitmap_bicubicfunction.
Syntax
int SNBDAPI CIMG_resize_bitmap_bicubic(int width, int height);
Remark
Table28.19:CIMG_resize_bitmap_bicubicFunctionVariables
Variable
Description
width
Widthofimageinpixels
height
Heightofimageinpixels
Returns
Returnstheresizebitmapbicubicinterpolationalgorithmoperation.Anyvaluelessthanzerois
aSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_resize_bitmap_interp()
Thisfunctionscalestheimageupordowntothenewheightandwidth.Theinterpaverages
neighboringpixelsforscalingdownallimagetypes.Thispermanentlychangestheheightand
widthoftheimage.
Syntax
int SNBDAPI CIMG_resize_bitmap_interp(int width, int height);
Remark
Table28.20:CIMG_resize_bitmap_interpFunctionVariables
Variable
Description
width
Newwidthofimage
height
Newheightofimage
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Chapter28-ImageProcessingFunctions
Returns
ReturnsaFORMAT_NOT_ALLOWEDerrormessageforimageswithabit-depthof4.Returns
aPALETTE_IMAGES_NOT_ALLOWEDerrormessageforcolor8-bitimages.Mayreturna
OUT_OF_MEMORYerrormessage.SeeAppendix
H,
Snowbound
Error
Codes
foralistof
errorcodes.
CIMG_rotate_bitmap()
Thisfunctionpermanentlyrotatestheimagebufferinmemorybythespecifiedangle.Thevalue
isinhundredthsofdegrees.Forexample,for90degreesuse9000.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
Thisfunctionisusedinthefollowingsamples:
l
Alpha
l
ASP
Image
View
Note:
ItisexpectedbehaviorthattheimageissmallerineachrotationusingIMG_rotate_
bitmap.Ifanimageisrotatedby90degrees,RasterMaster.NETflipsfromportraitto
landscape(orvice-versa)andpreservesthepagecontent.Iftheimageisrotatedby
somethingotherthan90degrees,RasterMaster.NETshrinksthepagesothatallthe
contentispreserved.RasterMaster.NETdoesnotcroptheedgesduringtherotation.
Syntax
int SNBDAPI CIMG_rotate_bitmap(int angle);
Remark
Table28.21:CIMG_rotate_bitmapFunctionVariable
Variable
Description
angle
Rotationinhundredthsofdegrees
Returns
Returnstherotatebitmapoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
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Chapter28-ImageProcessingFunctions
CIMG_runs_to_dib()
TheRasterMaster.NETlibrarystoresall1-bitimagesasaseriesofruns.Acalltothisfunction
forcestheimagetobestoredasrawuncompresseddata.Thisfunctiononlyworksfor1-bit
images.
Syntax
int SNBDAPI CIMG_runs_to_dib(void);
Returns
Returnsthestoredrawuncompresseddataoperation.Anyvaluelessthanzeroisa
Snowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_set_display_angle()
ThisfunctionrotatestheangleoftheimageatdisplaytimewhencallingCIMG_display_
bitmap_aspect().Theoriginalimagedataisnotaffected.SeeCIMG_
display_
bitmap_
aspect
()
formoreinformation.
Tosavetheimageasrotated,useCIMG_rotate_bitmap().Theimageispermanently
rotatedinmemory.SeeCIMG_
rotate_
bitmap
()
formoreinformation.
Usethisfunctiononallimagetypesforfastrotation.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
ThisfunctionisusedintheAlpha
sample.
Syntax
int SNBDAPI CIMG_set_display_angle(int rotate_angle);
Remark
Table28.22:CIMG_set_display_angleFunctionVariable
Variable
Description
rotate_angle
Rotatesimageby0,90,280or270
Returns
Returnsthesetdisplayangleoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
216
Chapter28-ImageProcessingFunctions
CIMG_sharpen_bitmap()
Thisfunctionsharpensorblurstheimage.PositivevaluessharpentheimageusingaLaplacian
functionwhilenegativevaluesblurtheimageusinganimage-averagingfilter.
Syntax
int SNBDAPI CIMG_sharpen_bitmap(int sharpness);
Remark
Table28.23:CIMG_sharpen_bitmapFunctionVariable
Variable
Description
sharpness
Integervaluefrom-127to127
Returns
Returnsthesharpenbitmapoperation.Avalueof0indicatessuccess.ReturnsaFORMAT_
NOT_ALLOWEDerrormessagefor1-bit(blackandwhite)imagesandfor4-bitor8-bitcolor
images.ReturnsanOUT_OF_MEMORYerrorifthereisnotenoughmemorytocompletethe
operation.AnyvaluelessthanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_get_palette()
ThisfunctionreturnsthepaletteentriesofthespecifiedimageintoanarrayofRGBQUAD
structures.
l
1-bitimages=2entries
l
4-bitimages=16entries
l
8/24-bitimages=256entries
24-bitimageshavenopalettesbuttheautocolororrainbowpaletteisreturned.
Syntax
int SNBDAPI CIMGLOW_get_palette(Array *arrRGBQuad);
Remark
Table28.24:CIMGLOW_get_paletteFunctionVariables
Variable
Description
arrRGBQuad
ArrayofRGBQUADstructures
217
Chapter28-ImageProcessingFunctions
Returns
Returnsthegetpaletteoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_get_raster()
Thisfunctiongetsalineofrawdatafromthelinenumberspecifiedbyypos.
Syntax
int SNBDAPI CIMGLOW_get_raster(Array *data, int ypos, int bytes);
Remark
Table28.25:CIMGLOW_get_rasterFunctionVariables
Variable
Description
data
Buffertoreceivealineofrawrasterdata.
ypos
Linenumberofrastertoget.
bytes
Returnsnomorethanthisnumberofbytes.Ifsetto-1,it
calculatesthenumberofbytesinonelineandreturnsthat
amount.
Returns
Returnsnomorethanthenumberofbytesspecified.Ifsetto-1,thenumberofbytesinoneline
arecalculatedandreturned.
CIMGLOW_put_palette()
ThisfunctionsetsthepaletteentriesofthespecifiedimagefromanarrayofRGBQUAD
structures.
l
1-bitimages=2entries
l
4-bitimages=16entries
l
8/24-bitimages=256entries
Syntax
int SNBDAPI CIMGLOW_put_palette(IMG_RGBQUAD *input_prgb);
Remark
Table28.26:CIMGLOW_put_paletteFunctionVariables
218
Chapter28-ImageProcessingFunctions
Variable
Description
input_prgb
PointertoarrayofRGBQUADstructures
Returns
Returnstheputpaletteoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_put_raster()
ThisfunctionputsalineofrawdataintotheDIBspecifiedbydataattheyposlinenumber.
Syntax
int SNBDAPI CIMGLOW_put_raster(Array *data, int ypos, int bytes);
Remark
Table28.27:CIMGLOW_put_rasterFunctionVariables
Variable
Description
data
BufferofrawtodatatoputintoDIB
ypos
Linenumberinwhichtoputdata
bytes
Replacesnomorethanthisnumberofbytes
Returns
Returnstheputrasteroperation.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_set_fast_convert()
Thisfunctiongreatlyimprovesperformancefordecompressionandconversion.Pagesmustbe
decompressedsequentially.Thisfunctioncanbeusedwithanyofthedecompression
functions,eitherfromFileI/Obasedormemory.Toturnthisfunctionon,settheoff_onvalueto
1. Toresetthisfunction,settheoff_onvalueto0.
Thisfunctionmakesthedecompressionfunctionsnon-reentrantornolongerthreadsafewhen
turnedon.
Note:
ThisfunctioncurrentlyonlyworkswithMO:DCAorAFPimages.
Syntax
int SNBDAPI CIMGLOW_set_fast_convert(int off_on, int format);
219
Chapter28-ImageProcessingFunctions
Remark
Table28.28:CIMGLOW_set_fast_convertFunctionVariables
Variable
Description
off_on
0=Off
1=On
format
Setstheformat
Returns
Returnsthesetfastconversionoperation.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
220
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